7 Ccis; Digital Network - NEC NEAX 2000 IVS 2 System Manual

No. 7 CCIS
The PBX can provide No. 7 CCIS via either a digital network or an analog network. Regardless
of the relevant network being a digital network or an analog network, CCH (Common Channel
Handler) to control the common signaling channel is required.

DIGITAL NETWORK

When No. 7 CCIS is provided via a digital network, the CCH is connected to the DTI by a fixed
path in the TDSW and transmits/receives common signaling data to/from the distant office
through a predetermined channel. Voice signals are transmitted/received on each line basis
through other channels.
Figure 1-3 shows the system configuration of No. 7 CCIS provided via a digital network.
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NEAX2000 IVS CCIS System Manual
ND-70918 (E), Issue 1.0
Figure 1-3 No. 7 CCIS with DTI
PBX
24/30 CHANNEL PCM
DIGITAL LINE
DTI
CCH
TDSW
MP
(PLO)
DTI : 24/30 Channel Digital Trunk Interface
CCH : Common Channel Handler
PLO : Phase Locked Oscillator
CHAPTER 1 GENERAL INFORMATION
DIGITAL PBX
DTI
CCH
TDSW
MP
(PLO)
System Outline
Page 7